20464320 has 56 divisors (see below), whose sum is σ = 64977264. Its totient is φ = 5456896.

The previous prime is 20464291. The next prime is 20464321. The reversal of 20464320 is 2346402.

It is not an unprimeable number, because it can be changed into a prime (20464321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9699 + ... + 11618.

Almost surely, 2^20464320 is an apocalyptic number.

20464320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20464320 is an abundant number, since it is smaller than the sum of its proper divisors (44512944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20464320 is a wasteful number, since it uses less digits than its factorization.

20464320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21337 (or 21327 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20464320 is about 4523.7506562586. The cubic root of 20464320 is about 273.5263096232.

The spelling of 20464320 in words is "twenty million, four hundred sixty-four thousand, three hundred twenty".